org.modeshape.jcr.query.model.NodeId Maven / Gradle / Ivy
/*
* ModeShape (http://www.modeshape.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.modeshape.jcr.query.model;
import java.util.Set;
import javax.jcr.Node;
import org.modeshape.common.annotation.Immutable;
/**
* A dynamic operand that evaluates to the {@link Node#getIdentifier() identifier} of a node given by a selector, used in a
* {@link Comparison} constraint.
*/
@Immutable
public class NodeId implements DynamicOperand, org.modeshape.jcr.api.query.qom.NodeId {
private static final long serialVersionUID = 1L;
private final Set selectorNames;
/**
* Create a dynamic operand that evaluates to the {@link Node#getIdentifier() identifier} of the node described by the
* selector.
*
* @param selectorName the name of the selector
* @throws IllegalArgumentException if the selector name or property name are null
*/
public NodeId( SelectorName selectorName ) {
this.selectorNames = SelectorName.nameSetFrom(selectorName);
}
/**
* Get the selector symbol upon which this operand applies.
*
* @return the one selector names used by this operand; never null
*/
public SelectorName selectorName() {
return selectorNames.iterator().next();
}
@Override
public Set selectorNames() {
return selectorNames;
}
@Override
public String getSelectorName() {
return selectorName().getString();
}
@Override
public String toString() {
return Visitors.readable(this);
}
@Override
public int hashCode() {
return selectorNames().hashCode();
}
@Override
public boolean equals( Object obj ) {
if (obj == this) return true;
if (obj instanceof NodeId) {
NodeId that = (NodeId)obj;
return this.selectorNames().equals(that.selectorNames());
}
return false;
}
@Override
public void accept( Visitor visitor ) {
visitor.visit(this);
}
}
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